Walmart Employees can't assept tips?

I took on of my watches in for a new battery and a band. Gal did a good job, took her time and was very careful. I liked her work so I gave her $5 as a tip. She said they couldn't accept tips and that she would get in trouble. I walked away smiling but she followed us and insisted that I take it back.

Accepting tips is not an issue as most of their patrons can't spell "tips" as it is not part of their vocabulary. This is how you phrase it. The excess $5 represents the markup that the competition would have charged vs. WalMarts "everyday low prices" and be sure to point at the yellow smiley face when saying that.